A tea drink preparation method for preparing a cold tea drink by: using high temperature and high pressure brewing machine to brew a powdered tea so as to make a hot tea drink, and then using a beverage cooling device to cool down the hot tea drink so as to obtain a cold tea drink, and then using a vessel to take the cold tea drink for service. Thus, this method shortens the contact time between the hot tea drink and the air and reduces the risk of tea drink contamination, avoiding deterioration in color and flavor due to oxidation and maintaining good tea drink hygiene.
